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          MDN上的在线运行是怎么做的（仅限html+css）
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        <p>MDN上有许多的教程支持在线运行，其中比较简单的是CSS+html的在线运行，速度很快没有卡顿，这里研究一下它是怎么实现的。</p>
<span id="more"></span>

<h2 id="示意链接"><a href="#示意链接" class="headerlink" title="示意链接"></a>示意链接</h2><p>​    在MDN上CSS学习部分的教程区有<a target="_blank" rel="noopener" href="https://developer.mozilla.org/zh-CN/docs/Learn/CSS/Building_blocks/Cascade_and_inheritance#%E4%BC%98%E5%85%88%E7%BA%A7">这一部分</a>，下面有两个编辑区域，第一个section用来显示，下面两个textarea用来分别编辑CSS和html的结构，由于避免影响外部页面它是嵌在iframe里面的。</p>
<h2 id="原理"><a href="#原理" class="headerlink" title="原理"></a>原理</h2><p>​    其实它实际上就是很简单的一个section，两个textarea和一个style的标签，而这个iframe中核心的playable.js其实只有短短的22行代码，<code>司马昭之心路人皆知</code>，这个js也是一目了然，没有什么trick，把它的html和js写在下面</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">style</span> <span class="attr">class</span>=<span class="string">&quot;editable&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">section</span> <span class="attr">class</span>=<span class="string">&quot;preview&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">section</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">textarea</span> <span class="attr">class</span>=<span class="string">&quot;playable&quot;</span> <span class="attr">style</span>=<span class="string">&quot;height: 120px;&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">textarea</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">textarea</span> <span class="attr">class</span>=<span class="string">&quot;playable&quot;</span> <span class="attr">style</span>=<span class="string">&quot;height: 120px;&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">textarea</span>&gt;</span></span><br></pre></td></tr></table></figure>

<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> section = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;section&#x27;</span>);</span><br><span class="line"><span class="keyword">var</span> editable = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.editable&#x27;</span>);</span><br><span class="line"><span class="keyword">var</span> textareaHTML = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.playable-html&#x27;</span>);</span><br><span class="line"><span class="keyword">var</span> textareaCSS = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.playable-css&#x27;</span>);</span><br><span class="line"><span class="keyword">var</span> reset = <span class="variable language_">document</span>.<span class="title function_">getElementById</span>(<span class="string">&#x27;reset&#x27;</span>);</span><br><span class="line"><span class="keyword">var</span> htmlCode = textareaHTML.<span class="property">value</span>;</span><br><span class="line"><span class="keyword">var</span> cssCode = textareaCSS.<span class="property">value</span>;</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">fillCode</span>(<span class="params"></span>) &#123;</span><br><span class="line">    editable.<span class="property">innerHTML</span> = textareaCSS.<span class="property">value</span>;</span><br><span class="line">    section.<span class="property">innerHTML</span> = textareaHTML.<span class="property">value</span>;</span><br><span class="line">&#125;</span><br><span class="line">reset.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    textareaHTML.<span class="property">value</span> = htmlCode;</span><br><span class="line">    textareaCSS.<span class="property">value</span> = cssCode;</span><br><span class="line">    <span class="title function_">fillCode</span>();</span><br><span class="line">&#125;);</span><br><span class="line">textareaHTML.<span class="title function_">addEventListener</span>(<span class="string">&#x27;input&#x27;</span>, fillCode);</span><br><span class="line">textareaCSS.<span class="title function_">addEventListener</span>(<span class="string">&#x27;input&#x27;</span>, fillCode);</span><br><span class="line"><span class="variable language_">window</span>.<span class="title function_">addEventListener</span>(<span class="string">&#x27;load&#x27;</span>, fillCode);</span><br></pre></td></tr></table></figure>

<h2 id="应用到博客里试一下"><a href="#应用到博客里试一下" class="headerlink" title="应用到博客里试一下"></a>应用到博客里试一下</h2><p>  把代码和相关的样式复制过来，就可以了，但是这里没有嵌入iframe，写个*{color:important}这样的样式，就会影响到整个博客的样式，博客的样式也会影响到这个在线运行的本身，所以针对h1或者列表这种博客已经全局赋予的样式会有所影响</p>

<style>
    /* 这边的样式是让编辑框和预览区域更好看的 */
    .playable {
    font-family: monospace;
    display: block;
    margin-bottom: 10px;
    background-color: #F4F7F8;
    border: none;
    border-left: 6px solid #558ABB;
    color: #4D4E53;
    width: 90%;
    max-width: 700px;
    padding: 10px 10px 0px;
    font-size: 90%;
  }
  .playable-css {
    height: 80px;
  }

  .playable-html {
    height: 160px;
  }

  .playable-buttons {
    text-align: right;
    width: 90%;
    max-width: 700px;
    padding: 5px 10px 5px 26px;
    font-size: 100%;
  }

  .preview {
    width: 90%;
    max-width: 700px;
    min-height: 100px;
    border: 1px solid #4D4E53;
    border-radius: 2px;
    padding: 10px 14px 10px 10px;
    margin-bottom: 10px;
  }

  .preview input {
    display: block;
    margin: 5px;
  }
</style>

<style class="editable"></style>
<div>
<section class="preview">
</section>
<textarea class="playable playable-css" style="height: 120px;">
</textarea>
<textarea class="playable playable-html" style="height: 120px;">
</textarea>
<script defer>
    var section = document.querySelector('section');
    var editable = document.querySelector('.editable');
    var textareaHTML = document.querySelector('.playable-html');
    var textareaCSS = document.querySelector('.playable-css');
    var reset = document.getElementById('reset');
    var htmlCode = textareaHTML.value;
    var cssCode = textareaCSS.value;
    function fillCode() {
        editable.innerHTML = textareaCSS.value;
        section.innerHTML = textareaHTML.value;
    }
    textareaHTML.addEventListener('input', fillCode);
    textareaCSS.addEventListener('input', fillCode);
</script>



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